1. From the Departments of Neurology (F.M., J.-R.G.-M., M.D.J., A.G.P.), Radiology (A.G., P.P., D.G.S., A.M.), and Hematology (M.C., I.E.), and Clinical Research Services (A.C.), Hospital Universitario Virgen del Roc|f8o, Seville, Spain; and the Neurovascular Research Laboratory, Institut de Recerca Vall d'Hebron, Hospital Vall d'Hebron, Barcelona, Spain (J.M., C.B., A.R.).